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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea9d056824e52a43853b0d8b8d64a243b7200edcef3db79437d4a40da0d6418' 
  AND token = 'gn10YAkhr2pbu2XhTuU+KYCKsV6rrT94XI+C4y61wdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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