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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88899d32f8f989d7d840df12f60d5c82402472f44d77e374cc4fcc22f3dfe788' 
  AND token = 'gSZ6obcgPT5Rt/Ha9+XK4vZFK7pizl3hRYBrWM7psQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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