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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb85747f9dbcc3b85f592d19992a219651927df8104bcb1ec396a9b432875b8' 
  AND token = 'cdOd7s8zwNgV3EFwOYkDdVKcwsj4+tf0U94EglkKODU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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