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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc17494114fe112b5c3d5c8703de9caf14e94c11489bc53f535582031dd959e' 
  AND token = '2Eufd8OTOf4BKc0Gljk/PgDuw5xSRlDaCN86F+zNEak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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