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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b096065d57a3a40d589872892888d454f32e7a2a4ffd0e4ae8341792cd751949' 
  AND token = '1QS5vCuBcyrSG/Y64Al7bHUVaaMFG1roQ7XCj0MjdS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}