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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7c1ad38eb4683090550975a931edb40158bb7ad07df0a4e4b2d0f49b6a2acf' 
  AND token = '8cDx8ehHbFk+PVG+TIOmQr011lUztfa5LNQCrHz4E/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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