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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b3f4f7093c82c6ac4cd9353100b0aa6a9751df9a9dabc1fc46d3b7ad255e82' 
  AND token = 'NDfUofNeas2TlHqSp9nJLaZX8uvmezHV4iNQLzPLmbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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