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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e58e3f97ec1d59fec0c397f12b513821f48f10d0a8ba755a512d46f98be1eb' 
  AND token = 'g/SfzkU5O6pJbST/wySKhs43EWwDqdRpfYURovqm9xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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