SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64449ebaec807ef80d2e299c228ae59325447602397e0084f50cbf23f0d766e7' 
  AND token = 'u7bXAQpzCs4BpYrCnZyJBCXUoXtunYfMMO7dr9lH++c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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