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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f943ab4bd9a3f394588c18bd835c049cd53b0c87a8e681a89d9bfebb0151b5f' 
  AND token = '7Ik5aO/t6oAPWpBaQgt5ci8Yn0yM9rI+vjBrUf/z3NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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