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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7515e954a8af00c4df7b47669776edf35f2819ceb1c6d52d9210c54120ab7ae' 
  AND token = '3wpEEGSdTQbVIGOU5ERwRuqZQqqFt0NxTjfIFiD78w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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