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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fac347c527a99fc78b0f7dd95c9bfd79604f91ee90cf61d550eaf1cb2a9538' 
  AND token = 's5UlOR60DzlL2kwFzeLC6GfRReQt0QVwrKAWN93NkOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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