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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bba3f800f205cee4a6018c76d999ec7573b1c105430ae1b3b8cafe38dc0a2e' 
  AND token = 'm2QESZN79mmpB9fF75IwV8mfOfGqSpj1E/RGYB0/s4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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