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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c0f5c9bbeeb01970fe8278da5f938a1b540ea3878ee131c369abb0a7aee556' 
  AND token = 'wel8zODnQxRNsRlrtArCihm8+bozzCfcYTmfHF4oKnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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