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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958c1097499b0cc66e21e03f89e6549c28a2bf2c8bcde2a4470a28e28bcc6112' 
  AND token = '7kZClyhQoNp4lTdI9s7bhj285a9LD+T+0LhXV0J5MXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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