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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1861c08d684e807834723f790d74f13be9c05ece99f6d941e6f210c7328734da' 
  AND token = 'OddgIB4R14lA0x1bcar71vL7JY7QVfk41BVwcUq90o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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