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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591dfb773df7646b67f8b5206592ded42edaf6c4de89fdc7e1f8f271c3acf734' 
  AND token = '5ZrvkFh9zvTKjoDR9lhn64YzCYonvoSJ3mmTzZWFdDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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