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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2593c8dc98b57fd900c7d5ee36fc4e111fde614ca1eab7eb9b1f311dc817b1c9' 
  AND token = 'ajYjlxF1ZEhXQ5GvFNgur8Vi0+loe5sWIJ2d+3wasGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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