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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32bef959d8eeae23184ca1d5834f6e020175f5884cc930ce693f3617c43ec61' 
  AND token = 'XdoR1C8k8PiQJ0hnjQzYHB3ZcMTth62WMlSbucCim4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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