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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167ee439be386a8707adf9b9079164b8cfe7ce466028eb4e2c3aad135a5d822f' 
  AND token = 'Qyoh0Q86KnuyxoFMzDIwMkcNah4Zi1y6Ut6mrua0cLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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