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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f699a5f478d27e76b145af094ef7f1969bf968c5f20b2aa51c75d70d51e1a4' 
  AND token = 'Ie2EZVQm5l7GA3avh3RTFYssPoyKK8WiBllrqP9q50k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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