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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6b7726f61de8aab517e9abda20f7f37f9d588d2663f39a87215a1b6b66c679' 
  AND token = 'x0bXk6+C+dTqfWmL/EZIlo9XjKz326LP4mIfbqzPhzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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