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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bc27fa7e138f46f245de26cff11093ddb647c5e5a89fb8885492d375130401' 
  AND token = 'Ap9Cc0s6/dasEFUfgS5qY1IxX19mh8ttHpDbJ11SpeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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