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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0feedb30aafdc8d99633c75c228a3cc994ca55b9e78e2be25c7a46c08646dc92' 
  AND token = 'rB2MofzvbtwI47jPnx1T0tjS6mUh3Kj3X5G4yr1sns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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