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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9cd2c1ad6a39cf4e0f2bc7c8af5d8bccbe10ff1c0c27261bf8e1ba5a7ba849' 
  AND token = 'Vk1pqz0icuzuE+2gN+hgi8BHpkhyUlp/EStWHMRElBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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