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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3fff92face73b064ad11618dae4768acf428677a40f461cb9f5f03088c5528' 
  AND token = 'Gd/QQaOB81aV1d+mY4EhfTEWMLoa2mvH9TxreK5abVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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