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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947f59c13d0e4cf86764f582e8097998931d7fd684efed5c254d92112f7b357d' 
  AND token = 'Ox9zbU0IuAR4bq3Cw3j1xiarDvqgxau9Wu211kWRV78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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