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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3bda66543b9572e406040bbe86856dfd0ea7130b913b3b26a97c24333c96db' 
  AND token = 'cZ4GsazhQxzKn2zD5bM8IO5rfaLL30jltxdF9OjtkK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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