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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3038b58b0bb3d127184ea73a5d70b8788b8d7fd38c79a36866d332fe98fe88' 
  AND token = 'WQad7WPFaXbIdr3df4r9bQsycqGzKLJuxjbG9V6lMtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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