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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e34a28f17c8468f2d70264727189e2f60f7903df0d9254b54dc5722a8aeeaf' 
  AND token = 'qteFvcanB7xVVuSKqS860VBsyUJQcx9zK1kQCq25rrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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