SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88c698fd2b4e3392d77101634e0986bfb198c802d9f7cfee41f5cd1a6023da6' 
  AND token = '7ZgQ6Qlb9rBa1Clq2yKBf3cVYn0NbQXiHX/wIgOPqjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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