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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdabf68263528bfa3c93d5282ab87c26ed30e14fb046ca8945522a65acb857d' 
  AND token = 'aKDl+9FdZNMPBaaAirA9wrhqfDwo1v51vA9aI/FnNNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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