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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc1f928e7a6a224f97a43b5d77d2c8a5762f1baa87f128cd9d8f6644d39673a' 
  AND token = 'tfWqZd0yyr988UQUdXHUXPcW255kPlEao06utz3lxMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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