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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2433da6a22b05f24ad7097b8ec7b2d5cb3146b8750b6a3744314b599f2c4180f' 
  AND token = 'ApKvdkeRPpoa8HuT0wfsem5ql//uF1z4TuLX5a4yPxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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