SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3418b8c963381ea9f0037864156fa7ffbb5c10c929d87cdb2f939cfc734cda5' 
  AND token = 'ir1SYvYTIV60JrBOwLL7ROOIrnKqGekqpUzwU1O0+kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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