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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae8deaced31e845ec345d7ef7592bc1e8ec256abff9c41c0edf8e94e2130690' 
  AND token = 'YevcA05BeUZv2Am8C2vmOoWD3+Qe4pO8v2tcknoloYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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