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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569d31af9e38b151df35a14cc3c32f406a677cac49e91eda4fd291e064112e5f' 
  AND token = '9655rBOt7mlS0b4MJrVxTdKmVI3Q0XqyXkPoSNVzeLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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