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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eddc121af9295c4f76db88a6b6a01628b8498a8b4daf77ac33e16324756ce24' 
  AND token = 'gdQHOWgGPQZ1wXjL0g4ZvN2PVrQTbC98Onc1a/DcV9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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