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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe30fe5382be50b8df9ade57586f10a60fe0ade14d18b6be3fdd28086033e07f' 
  AND token = 'wEUhritv2bMN9W7Rd9572De+jcOLjEcDpZkbIrc9p50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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