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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb67f8c17693100635b096282b593d364e0bd1b096ce5a688e49874c0ccd6e98' 
  AND token = 'AutXlTUTExOLxQilgH+ljF0oCKPe9/5f16eFMwq8vWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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