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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b536deb58306ee2eb8cf070ec8a21333515b864990731297848e2d755ee1e3' 
  AND token = 'fAovs1WxKWgExWnuGd2JMj9hLx+q/U0TE2GSdXggopA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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