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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529fa6bab54480707dce636a219db2ee0ea0d4be0026656f55acc09f2573ffe1' 
  AND token = 'Ye5oXbmbmKzIfdWvw9UV3netbx6Ljg7tgb7tcgGZ8Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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