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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717088998ab19ce48a3a7f606913d2fd4b08dbbe4c03c2fa90af3ed8925c10af' 
  AND token = 'HVJhcNHeqVlg0xu4B0D3b5O1g1WGi3HRPqKK8VI8V3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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