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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7c9bb0d91b870b645e2955c65c11b8ba704557b4c05e3f00c99cfb9eee01bf' 
  AND token = 'DnTZd+5UxB/+dPCmuMzRgP7+r6BcBHb11jVloh1f7dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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