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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683ba2549c3ce687a3e394f5e8c040f6df3ef009ddb8a1f34a5a3ff7f161e3e5' 
  AND token = 'ZxFRJtVzUw1YjIjaS50g6GiDsDAdTHAWlxNG4KFI63E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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