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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d7716438201d1b577cfd744a7c6e4352c42871bbd27e12a4eaffb86e56d071' 
  AND token = 'xSOl817dEjFAq7K5t//VUEe4CRkT1XTTm/G+fNkVt8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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