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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dcd0877d17730c96238713224dde0ed899e5e26421747e1bb36edeafb67d3d' 
  AND token = 'w3ZI47DU0fGXQBAoQeoLvuW3Qz8Hi9RXhmH6qbGLppg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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