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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b62ec337ceb6af33ab78534e28fa42f23e37dd767b29bf9d9df267eb30ab2d' 
  AND token = 'cslr6QrSD5O49dmQ9w3vmH9/V0AxkUEzTlmTCBLhLY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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