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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c076030ec7bd59b37496e89fe5ce0b5f9af035bb95ebe636018e215aa3ee50d' 
  AND token = '+iuFoiBhOLnwKY3tOhhtL6QAzOIoTcrRLnoiYka2LX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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