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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b248a04926c61af2c3dc5a76ef04f1e326270e587fd724939f77d21e59aaadd' 
  AND token = 'iLngC7UjbbldTG5nrN3XBH3ambQ7/aKMgmGlC8jLvFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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