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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cd46848dca0d0940eea6b9d8d8a94faf6cec932204c8202f9e9f4b1d1bdece' 
  AND token = '/WCQZOxIunKTcC7kzHnbcqhpVTSxqJRbZsBkpwwRBDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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