Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c2c781176ca83df96246d3e6f4856cb4238a66f836e6615e93e96692c2351b' 
  AND token = 'SC+vtEOGdT9zVpe7hYN0iObnPLhoVSMIidCITMRCaM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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