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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8d9bf9dbae5342d98298a48c67bb73f0af8c39c8114bd085d97caf4fcdc5ab' 
  AND token = '+DaWiMsNg8VDg3hK450ZvPiDYzjrdirMr9jTmf05Prw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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