SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74f387ce5212bad77c4c2903ede9ecbf86301bc0e8b14b3ed7546fac8e2b4f3' 
  AND token = 'BjYVyHKYxtoXQdakU8GJ6WKizQZqYgjf7PJOiSyva80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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