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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f299a72b6cf65c4f8cce425985d6f700ae288ef200ea6df5af299cbafb43db5c' 
  AND token = 'oQ5Hpa0F6cAPFDF6n4fGLOIjpxleY9g1g+R1Ddqyeis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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