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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982cfa25babbd80a6ea9e10bb3e97a37f3ebcdfa6bde1d9b7de5d01e581fade6' 
  AND token = 'YJsx4vndC4UBtqKmi53uwTm9k4wUC86MaTuUY30kckE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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