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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c479a966071fd29b622e94d065dc93101f35dc99b8e0bddcced46d6f9f32d1d4' 
  AND token = '9VNO95+TdN4tBvJtwwMUqHbn1sK2yZfUpEz+DjE0Y6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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