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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d84b8264a9a1404cca65651d0df95e23cf27509043db003219e0eddc039ce5' 
  AND token = 'bLk0EQY7fIbarkOeiMjEQlxun9XbUUt7qR/O5oBB6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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