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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9e43f1f1b507d49859530b9a150736999ad5209c3cbad9ecd85778ccf37032' 
  AND token = 'ZFm5P1SC8iNlg3beww0kbXSPys8Pj6arVSRNp9LTWOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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