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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cf667396a0c8ba31f05658e4da81f3707c20c14ae697c9082c8a9deb3d94cb' 
  AND token = 'FL3MdYW+SF3wXY0XSGU0xnMf3OqxNifyYkDcNKcJl4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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