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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03336e6cf7ee5c8f78e7cb4b6a7c8049246ab8dee1e94c8066d977aae62ffe4a' 
  AND token = 'R6hsyUgfabBjq9lUW0Se6Y/InJl12bRD3Gw4ksbdGTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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