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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819162532e354495fc7ba0a1bdcd1b286ff02a9ee10ab573739c95d2eaed6407' 
  AND token = 'CjxS5kbv2RwdzS0+G+O5drnF56lcszRZBZBGW6yappM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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