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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831b19f8bf038aa91bb7e2bcf08d9383858652b4ae0a868993fd4a6f2ddbea2b' 
  AND token = 'uc6c9uPthNNqgaOw2YV7ZTeriuUh61UDLi9xRjbfWKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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