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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60251889540f61751853cf126d4e86b16d1e9fc97dc40e8dab1a6db256dcc048' 
  AND token = '/VmpJXKpN0Umk0BOwDUND/a0HxxUctlIST7vNeUX47E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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