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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3f10b6e9d6b1d5bfcb56d5f6fa1c92b43f9e11e49f5f71fbfaf004f85e69d5' 
  AND token = 'VV9JYFtN/bHSBGzIUW90jrF9KR485/VAvHMECziu6Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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