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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1615e2aa8497cbbd3c2f412f1222f5802192ce5596afe5611a1d936e086142db' 
  AND token = 'YtZ6No+N+sasQERWvDJLuIbV2ZCN2OJ0euvvXC+TMYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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