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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997ee399cf7a084677e0eefba0c0f0e9c770c3e00c62d7cb1753897db0dfe5a6' 
  AND token = 'TxZYzRZSBAx/94bm8OM5UmFZO0v3oPsTzoPm9ES1zPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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