SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3b200300968af4be19679f0200a2b758ea9210ca94f21f7ea60baccd522d97' 
  AND token = 'RS+qjFXOrVmm/R1EETxHuzxzdFBDFFYCZ8GAJk+wAPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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