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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fb1dc442a6b633338df7eeb9d66a7cc9443e05f24d284a3786f0cd1bf23bce' 
  AND token = 'x0VkOrdpRRZRxrxgdl1fgVUtc8DOxdLj7Efm93v2FuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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