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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8b46698d0df0eab00f065a588faf07d17253565be51c5a566f2233fd1897b9' 
  AND token = '5HR9ionQyK5FtAEfJRaF72arcBDrno1uPAd4Gog3u1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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